Evidence suggests the dinosaur had scales rather than feathers or fluff, as some have speculated.
Tyrannosaur's last meal was two baby dinosaurs
New tiny T. rex species discovered - BBC Newsround
Dinosaurs and other ancient animals
Study casts doubt on the idea of 'big fluffy T. rex' - BBC News
T-rex feather theory disputed -- knock me down with a scale - CNET
BBC Radio 4 - The Curious Cases of Rutherford & Fry, Series 13
T-Rex and most other dinosaurs were warm blooded scientists find
T-Rex's image as a giant, scaly, monster supported by new study
Summer of Science - Plastic Poses a Growing Threat to Seabirds
Study casts doubt on the idea of 'big fluffy T. rex
Who would win in a fight: half a million cats or a T-Rex? - Quora
BBC Wildlife (Why Owls are not wise)